<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="test.js"></script>
</head>
<body>
    <!--//DOM渲染也属于一种宏任务-->
    <h1>哈哈哈</h1>
    
</body>
</html>